Supply Chain Management Blogs by Members
Learn about SAP SCM software from firsthand experiences of community members. Share your own post and join the conversation about supply chain management.
Showing results for 
Search instead for 
Did you mean: 
Active Contributor


As per SAP Help on Telegram Repetition and Channel Check
Synchronization means that after a connection was established by SAP EWM, the programmable logic controller (PLC) was given the opportunity to send all messages that accumulated during the period of disconnection.

PLC Sim emulator does not send telegrams if SAP EWM MFS communication channel is not started and not connected to the simulator. In fact the SEND button is disabled unless SAP EWM MFS is connected


Therefore it is recommended to switch off the channel synchronization while working with the emulator. That can be set up in SPRO SCM Extended Warehouse Management -> Extended Warehouse Management -> Material Flow System (MFS) -> Master Data -> Define Communication Channel

Nevertheless it is perfectly possible to simulate and test synchronization scenarios with the emulator.

Channel synchronization with the PLC emulator

The synchronization process is implemented with 3 types of telegrams:

  • synchronization setup, SYES

  • synchronization start, SYBE

  • synchronization end, SYED

The demo uses the following styling of the telegrams

  • LIFE - red

  • SYES - orange

  • SYBE - yellow

  • SYED - blue

  • handshake request - bold font

  • handshake acknowledgment - italic font

That is set up with the following properties in the emulator configuration file:

First, I have activated the synchronization for the LMS1 CONSYS 1 communication channel. The channel is stopped


Now, the channel is started from /SCWM/MON, node Material Flow System -> Communication Channel. The channel status is set to A indicating synchronization being executed. That sends the SYES telegram from SAP EWM MFS


Next, the SYBE telegram is sent to SAP EWM MFS indicating the beginning of the synchronization


The communication channel status is not changed by the SYBE telegram, as it is only the beginning of the synchronization. The synchronization is concluded with the SYEN telegram sent to SAP EWM MFS


The SYEN telegram updates the status of the communication channel to B, indicating successful synchronization


Now the channel is connected and synchronized. The LIFE telegrams start flowing and the channel is ready for regular communication

Labels in this area